Argyranthemum plant named ‘SUN 500’

ABSTRACT

A new and distinct cultivar of  Argyranthemum  plant named ‘SUN 500’, characterized by its uniformly mounded plant habit; freely branching habit; freely flowering habit; single-type inflorescences with white-colored ray florets; and good garden performance.

Botanical designation: Argyranthemum frutescens.

Cultivar denomination: ‘SUN 500’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Argyranthemum plant, botanically known as Argyranthemum frutescens and hereinafter referred to by the cultivar name ‘SUN 500’.

The objective of the breeding program is to create new Argyranthemum plants with attractive ray and disc floret colors and good garden performance and pest resistance.

The new Argyranthemum plant originated from a cross-pollination made by the Inventor in August, 2012 in Glandorf, Germany of two unnamed seedling selections of Argyranthemum frutescens, not patented. The new Argyranthemum plant was discovered and selected by the Inventor as a single flowering plant from within the progeny of the stated cross-pollination in a controlled greenhouse environment in Glandorf, Germany in July, 2013.

Asexual reproduction of the new Argyranthemum plant by vegetative tip cuttings was first conducted in Glandorf, Germany in February, 2014. Asexual reproduction by cuttings has shown that the unique features of this new Argyranthemum plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Argyranthemum have not been observed under all possible combinations of environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature, daylength and light intensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of the new Argyranthemum plant. These characteristics in combination distinguish ‘SUN 500’ as a new and distinct Argyranthemum plant:

-   -   1. Uniformly mounded plant habit.     -   2. Freely branching habit.     -   3. Freely flowering habit.     -   4. Single-type inflorescences with white-colored ray florets.     -   5. Good garden performance.

Plants of the new Argyranthemum differ from plants of the parent selections primarily in uniformity as plants of the new Argyranthemum are more uniformly mounding than plants of the parent selections.

Plants of the new Argyranthemum can be compared to plants of Argyranthemum frutescens ‘SUN 20’, not patented. In side-by-side comparisons conducted in Glandorf, Germany, plants of the new Argyranthemum differed primarily from plants of ‘SUN 20’ in ray floret color as plants of ‘SUN 20’ have pink-colored ray florets.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs illustrate the overall appearance of the new Argyranthemum showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Argyranthemum plant.

The photograph on the first sheet comprises a side perspective view of a typical flowering plant of ‘SUN 500’ grown in a container.

The photograph on the second sheet is a close-up view of a typical flowering plant of ‘SUN 500’.

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations and measurements describe plants grown during the spring and early summer in 9-cm containers in a glass-covered greenhouse in Glandorf, Germany and under cultural practices typical of commercial potted Argyranthemum production. During the production of the plants, day temperatures ranged from 14° C. to 28° C., night temperatures ranged from 10° C. to 18° C. and light levels ranged from 25 klux to 90 klux. Plants were pinched one time five weeks after planting and were 2.5 months old when the photographs and description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2007 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical classification: Argyranthemum frutescens ‘SUN 500’. -   Parentage:     -   -   Female, or seed, parent.—Unnamed seedling selection of             Argyranthemum frutescens, not patented.         -   Male, or pollen, parent.—Unnamed seedling selection of             Argyranthemum frutescens, not patented. -   Propagation:     -   -   Type.—Terminal cuttings.         -   Time to initiate roots, summer.—About 8 to 10 days at             temperatures about 18° C. to 24° C.         -   Time to initiate roots, winter.—About 10 to 15 days at             temperatures about 14° C. to 18° C.         -   Time to produce a rooted young plant, summer.—About 14 to 16             days at temperatures about 18° C. to 24° C.         -   Time to produce a rooted young plant, winter.—About 16 to 20             days at temperatures about 14° C. to 18° C.         -   Root description.—Fine to medium in thickness, fibrous;             typically white in color, actual color of the roots is             dependent on substrate composition, water quality,             fertilizer type and formulation, substrate temperature and             physiological age of roots.         -   Rooting habit.—Moderate branching; medium density. -   Plant description:     -   -   Plant and growth habit.—Herbaceous perennial; uniformly             mounding plant habit; upright to broadly spreading form;             overall shape, roughly flattened globular; moderately             vigorous growth habit.         -   Branching habit.—Freely branching growth habit with about             eight lateral branches developing per plant; pinching             enhances lateral branch development.         -   Plant height.—About 14.8 cm.         -   Plant width.—About 24.5 cm.         -   Lateral branches.—Length: About 8.3 cm. Diameter: About             4 mm. Internode length: About 8 mm. Strength: Strong; young             stems, flexible. Texture: Smooth, glabrous. Luster: Slightly             glossy. Color: Close to 145B; axial stripes, close to 144B. -   Leaf description:     -   -   Arrangement.—Alternate, simple; sessile.         -   Length.—About 7.2 cm.         -   Width.—About 4.8 cm.         -   Shape.—Pinnatisect; in outline, obovate.         -   Apex.—Acute.         -   Base.—Cuneate.         -   Margin.—Deeply incised.         -   Sinuses.—Parallel to slightly convergent.         -   Texture, upper and lower surfaces.—Smooth, glabrous;             leathery.         -   Luster, upper and lower surfaces.—Matte.         -   Venation.—Pinnate.         -   Color.—Developing leaves, upper surface: Close to 137B.             Developing leaves, lower surface: Close to 137C. Fully             expanded leaves, upper surface: Close to N137C; venation,             close to 138A to 138B. Fully expanded leaves, lower surface:             Close to 137C; venation, close to 138A. -   Inflorescence description:     -   -   Inflorescence form and arrangement.—Single-type terminal and             axillary inflorescences held above and beyond the foliar             plane on strong peduncles; ray and disc florets arranged             acropetally on a receptacle; inflorescences face mostly             upright to slightly outwardly.         -   Flowering habit.—Freely flowering habit with about 130             inflorescences developing per plant during the flowering             season.         -   Flowering season.—Plants flower from spring to late summer             in Germany; flowering continuous during this period.         -   Inflorescence longevity.—Inflorescences last about two to             three weeks on the plant; inflorescences not persistent.         -   Fragrance.—Moderately fragrant.         -   Inflorescence buds.—Height: About 7 mm. Diameter: About             7 mm. Shape: Broadly ovate. Color: Towards the base, close             to 137C; towards the apex, close to NN155C; towards the             margins, close to 199B.         -   Inflorescence size.—Diameter: About 5.5 cm. Depth (height):             About 1.6 cm. Diameter of disc: About 1.5 cm. Receptacle             diameter: About 3.5 mm. Receptacle height: About 4.5 mm.         -   Ray florets.—Quantity per inflorescence and arrangement:             About 32 arranged in about two whorls. Length: About 2.4 cm.             Width: About 8 mm. Shape: Oblong to elliptic. Apex:             Shallowly praemorse. Base: Attenuate. Margin: Entire.             Texture, upper surface: Smooth, glabrous; velvety. Texture,             lower surface: Glabrous; carinate. Luster, upper surface:             Matte. Luster, lower surface: Slightly glossy. Color: When             opening, upper surface: Close to NN155C. When opening, lower             surface: Close to NN155D. Fully opened, upper and lower             surfaces: Close to NN155D; color does not change with             development.         -   Disc florets.—Quantity per inflorescence and arrangement:             About 180 spirally arranged at center of receptacle. Length:             About 6 mm. Diameter, apex: About 2 mm. Diameter, base:             About 0.75 mm. Shape: Tubular with five free apical lobes.             Apex: Acute. Texture, inner and outer surfaces: Smooth,             glabrous. Luster, inner surface: Glossy. Luster, outer             surface: Matte. Color, immature, inner and outer surfaces:             Apex: Close to 164B. Mid-section and base: Close to 150D.             Color, mature, inner and outer surfaces: Apex: Close to 13A.             Mid-section and base: Close to 145D.         -   Phyllaries.—Quantity per inflorescence and arrangement:             About 24 arranged in two whorls. Length: About 5 mm. Width:             About 2.5 mm. Shape: Ovate. Apex: Praemorse. Base: Broadly             cuneate. Margin: Entire. Texture, upper and lower surfaces:             Smooth, glabrous; edges, papery. Luster, upper surface:             Glossy. Luster, lower surface: Matte. Color, upper surface:             Close to 145A; margins and papery edges, close to 199B and             158D. Color, lower surface: Close to 143B to 143C; margins             and papery edges, close to 199B and 158D.         -   Peduncles.—Length, terminal peduncle: About 3 cm. Length,             fourth peduncle: About 5.5 cm. Diameter: About 2 mm. Angle:             Terminal peduncle, erect; lateral peduncles, about 40° from             branch axis. Strength: Strong. Texture: Slightly ribbed,             glabrous. Luster: Slightly glossy. Color: Close to 138A.         -   Reproductive organs.—Androecium: Present on disc florets             only. Filament length: About 2 mm. Anther length: About             1 mm. Anther shape: Lanceolate; basifixed. Anther color:             Close to 13A. Pollen amount: Moderately to high. Pollen             color: Close to 17A. Gynoecium: Present on both ray and disc             florets. Pistil length: About 4 mm. Stigma shape: Decurrent.             Stigma color: Close to 13A. Style length: About 3.5 mm.             Style color: Close to 145C. Ovary color: Close to 145D.         -   Seeds and fruits.—Seed and fruit production has not been             observed on plants of the new Argyranthemum. -   Disease & pest resistance: Plants of the new Argyranthemum have not     been shown to be resistant to pathogens and pests common to     Argyranthemum plants. -   Garden performance: Plants of the new Argyranthemum have been     observed to have good garden performance and to tolerate rain, wind,     high temperatures about 40° C. and to be hardy to USDA Hardiness     Zone 9. 

It is claimed:
 1. A new and distinct Argyranthemum plant named ‘SUN 500’ as illustrated and described. 